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46 active trials for Healthy Participants

Trial of Antibody Responses by Vitamin Supplementation

Streptococcus pneumoniae, commonly called pneumococcus, can cause a wide range of diseases in children from mild ear infections to deadly pneumonia or meningitis. Vaccination is currently the single best way to protect children. Nutrition, especially the amount of vitamin A, may play a role in how well your body responds to infection or a vaccine. We call this an immune response. This research will look to see if children who take a vitamin with their vaccine have a better immune response than children who do not take a vitamin with their vaccine. Primary Objective To evaluate the influence of vitamin A supplementation on Prevnar vaccine immunogenicity based on changes in antibody scores in a commercial ELISA at Day 21 (after a booster vaccine dose) compared to pre-vaccine values. Secondary Objectives To evaluate the relationship between baseline vitamin levels and pneumococcal or hepatitis A vaccine antibody responses (based on in commercial ELISAs) at Days 0 and 21. To evaluate the influence of vitamin A supplementation on hepatitis vaccine immunogenicity based on changes in antibody scores in a commercial ELISA at Day 21 compared to pre-vaccine values. To evaluate relationships between total serum antibodies (based on individual IgM, IgG1, IgG2, IgG3, IgG4, and IgA scores in a Luminex assay) at Day 0 and changes between Days 0 and 21 with baseline (Day 0) vitamin levels in young children, and with vitamin A supplementation.

Start: August 2019
A Study of TAK-510 in Healthy Adults

It is hoped that TAK-510 will help people with symptoms of feeling sick (nausea) or being sick (vomiting). The main aims of the study are to check if healthy adults have side effects from TAK-510 and to check how much TAK-510 they can receive without getting side effects from it. The study will be in 3 parts. Participants will take part in only 1 of the 3 parts of the study. At the first visit, the study doctor will check if each person can take part. For those who can take part, they will be placed in 1 of many small groups. The 1st groups will join Part 1 of the study, the 2nd groups will join Part 2 and the 3rd groups will join Part 3. They will receive an injection under the skin of either TAK-510 or placebo. In this study, a placebo will look like the TAK-510 injection but will not have any medicine in it. In Part 1, the 1st group of participants will receive 1 injection of either TAK-510 or placebo. Different participants within this group will receive lower to higher doses of TAK-510. The participants in this group will stay in the clinic for 4 days after their injection for some tests and check for any side effects from their treatment. In Part 2, the 2nd group of participants will receive an injection of either TAK-510 or placebo, once a day for 5 days. Different participants within this group will receive lower to higher doses of TAK-510. The participants in this group will stay in the clinic for 9 days after their 1st injection for some tests and check for any side effects from their treatment. In Part 3, the 3rd group of participants will visit the clinic 2 times. At the 1st visit, they will receive an injection either of TAK-510 or placebo, once a day for 7 days. Each participant in this group will receive lower to higher doses of TAK-510. They will stay in the clinic for 8 days after their 1st injection for some tests and check for any side effects from their treatment. At the 2nd clinic visit, each participant will receive 1 single injection of TAK-510 or placebo. This will happen 7 days after their last injection from the previous clinic visit. They will receive the same dose as their previous dose. They will stay in the clinic for 3 days for some tests and check for any side effects from their treatment. After treatment, all participants in the study will return to the clinic for a weekly check-up visit for up to 3 weeks.

Start: February 2021